The San Diego County Water Authority is a wholesale agency providing water to the approximately 1,700,000 residents of San Diego County through its 24 member agencies. It owns, operates and maintains approximately 210 miles (338 km) of aqueduct pipelines. Original construction of the pipelines was in locations remote from urban development. However, during the past 20 years, urban development has encroached to the rights-of-way and, in many cases, over the rights-of-way. Several unique arrangements for the joint use of the rights-of-way corridors with other public agencies have provided benefits to the general public. Some of the problems the Authority has encountered are explained, and recommendations are presented on how similar problems can be avoided by others.